• Explosives and Blasting
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• v.23 no.1
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• pp.31-39
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• 2005

This study is based on the reseach about conte. track$(Dugso\~wonju)$ double line electric railway tunnel. Authors conducted test blasting to examine the effect of blasting pollution. To be conducted safe and effective work by using this result studies sailable substitution excavation method. No-vibration section generates continuously the vibration of breaker working to go abreast necessarily secondary fragmentation working and according to judging that application is actually difficult in case of the condition of study site, the period of construction, the cost of construction, the efficiency of construction, pre-heavy caliber horizontally boring working + line drilling method + vibration control secondary blasting method excavation working is possible from level within blast vibration standard.

• Explosives and Blasting
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• v.28 no.2
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• pp.1-16
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• 2010

This study focuses on the phenomenon that the blast damaged zone developed on rock slope surfaces can be affected by joint characteristics rather than by explosive power when the pre-splitting is applied to excavate a jointed rock slope. The characteristics of rock joints on a slope were investigated and categorized them into 4 cases. Also an image processing system has been used for comparing the distribution pattern of rock blocks. From this investigation, it was found that the rock blocks bigger than 2,000 mm occupied 42% in the case of single joint set and it showed the well efficiency of pre-splitting blast. In cases of 2~3 parallel joint sets and 2~3 intersecting joint sets are developed on rock surfaces, the rock blocks in the range of 1,000~2,000 mm occupied 43.6% and 35.8%, respectively, and it showed that the efficiency of pre-splitting was decreased. When more than 3 joint sets are randomly developed, however, the rock blocks in the range of 250~500 mm occupied 35% and there was no block bigger than 1,000 mm. This denotes that the blasting with pre-splitting was not effective. The numerical analysis using PFC2D showed that the blast damaged zone in a rock mass could be directly influenced by the pre-splitting. It is, therefore, required to investigate the discontinuity pattern on rock surfaces in advance, when the pre-splitting method is applied to excavate jointed rock slopes and to apply a flexible blating design with a consideration of the joint characteristics.

• Explosives and Blasting
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• v.27 no.1
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• pp.53-61
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• 2009

R.O.K's explosive manufacturing source was first black powder (B.P) introduced into Korea Dynasty from China. In 1890, black powder was first used for mining blasting in Masan. Nowadays, a vibration control blasting method using the emulsion explosive has been applid to explosive demolition of building structure, subway and road construction sites. In December, 2006, Korean Government and professional society (KSEE) established the blasting guidelines of Modern Vibration Controlled Blasting Method (MVCBM) which is an unprecedented in the world.

• Explosives and Blasting
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• v.28 no.1
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• pp.40-54
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• 2010

The messer shield method applys mainly to a tunnel with small cross-section of a weathered soil or weathered rock district and is fulfilled mostly by man-power excavation. but in case that hard rock exposes on tunnel face, incredible is an application of the rock-splitting method using a hydraulic power or a blasting method. This study represents the case of a blasting method which can control to be practiced by the minimum charges of 125 g an initial vibration occurring at the cut instead of the rock-splitting method, even though water pipe and gas pipe are closely adjacent.

• Explosives and Blasting
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• v.20 no.1
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• pp.25-34
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• 2002

일반적으로 도심지에서 터널 시공을 위한 암반굴착 작업은 주변 보안물건에 대해 직접적인 피해를 유발시킬 수 있는 공해요소인 진동을 허용기준값 이하로 제어할 수 있으면서 상대적으로 시공성과 경제성이 뛰어난 공법으로 수행되어야 한다. 본 사례에서는 각내의 대표적인 문화시설인 예술의 전당 하부를 통과하는 우면산 터널 공사현장에서 암반굴착공법으로 고려한 TTM 장비를 이용한 기계굴착, 플라즈마 공법, 유압장비를 이용한 할암공법, 겔파쇄 공법, 미진동파쇄기를 이용한 공법, 진동제어발파공법에 대한 현장 적용성을 시험시공 등을 통해 평가한 내용과 결과를 제시하였다. 비록 각 도심지 터널의 현장 상황이나 주변 여건에 따라 이 현장에서의 시험시공 내용이나 적용 결과를 그대로 적용할 수는 없겠지만, 진동제어 암반굴착 공법에 대한 시험시공이나 선정 과정에 이 사례연구가 개략적인 참고자료로 활용될 수 있을 것이다.

• Explosives and Blasting
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• v.21 no.1
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• pp.95-101
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• 2003

자연 기상현상의 재해는 인간의 힘으로 극복하기 매우 어렵다. 그 중 낙뢰는 기상 재해로 뇌운과 지면사이의 방전 현상을 말한다. 한반도는 기단이 해상을 통과 하면서 많은 에너지를 공급받아 쉽게 뇌운이 형성된다. 기상청의 자동 낙뢰 관측 장비에 의하면, 연간 1,300회 이상의 낙뢰가 발생 되는 것으로 알려져 있다. 낙뢰는 지사응로 방전되면서 인명·전자기기의 파손등 피해를 일으킨다. 특히 발파공법은 주로 지표 지중에서 실시되는 공법으로 낙뢰에 대하여 매우 취약하고, 그 피해 또한 심각하다. 본 연구는 화약발파 기술자들의 참고 자료로써 낙뢰에 대한 주의와 대책을 연구하는 뜻에서 작성한다.

• Explosives and Blasting
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• v.40 no.4
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• pp.47-56
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• 2022

It was designed as the mechanical excavation mass method on 176m because the safety thing is located around the site. But low-vibration blasting using an electronic detonator was proposed to improve constructability and economy. As a result of the suggestion blasting, both blasting noise and vibration were safe within the allowable limit, confirming the applicability of low-vibration blasting using an electronic detonator to the section. And compared with the mechanical mass excavation method, an economic evaluation was conducted about the section, and it was evaluated that there was an economic advantage as the construction period was reduced by 88 days.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.2
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• pp.197-208
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• 2022

The existence of shallow bedrock and the desire to use underground space necessitate the use of blasting methods. The standard blasting method under water after drilling is associated with certain technical difficulties, including reduced detonation power, the use of a fixed charge per delay, and decoupling. However, there is no blasting method to replace the existing blasting method. In this paper, a dry hole charged with ANFO blasting is assessed while employing a dry hole pumping system to remove water from the drill borehole. Additional standard blasting is also utilized to compare the blasting performances of the two methods. The least-squares linear regression method is adopted to analyze the blasting vibration velocity quantitatively using the measured vibration velocity for each blasting method and the vibration velocity model as a function of the scaled distance. The results show that the dry hole charged with ANFO blasting will lead to greater damping of the blasting vibration, more energy dissipation to crush the surrounding rock, and closer distances for the allowable velocity of the blasting vibration. Also, standard blasting shows much longer influencing distances and a wider range of the blasting pattern. The pilot test confirms the blasting efficiency of dry hole charged with ANFO blasting.

• Explosives and Blasting
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• v.34 no.3
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• pp.17-20
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• 2016

This paper introduce a multistage parallel non-vibration electronic tunnel blasting cases which adapts Electronic Blasting System(EBS) and the center-cut blasting method to excavating a single line railway tunnel close to residential area. As a result, it was revealed that the vibration and noise showed a reduction of 23.5% and 75% of compared with the allowable standard. We successfully completed the tunnel excavation with decreasing construction time and construction cost and without civil compliant.

• Explosives and Blasting
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• v.21 no.1
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• pp.49-58
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• 2003

현재 발파의 수행은 채석, 채굴 및 지하철과 도로, 건축, 토목공사 등 다양한 분야에 적용되고 있다. 이에 따라 발파특성의 연구와 관련하여 다양한 이론이 도출되고 있고 사용되지만 발파에 의한 공해인 진동 및 소음의 문제가 대두되면서 또한 이들의 취약점을 보완하기 위해 다양한 공법들이 시행되고 개선되어지고 있다. 본 연구에서는 기존의 발파공법과 Air tubes를 이용한 발파공법을 비교하므로 화약의 사용량을 보다 감소시키고, 기존 전색의 길이를 줄이므로 폭약의 투사면적을 증대시켜 진동 및 폭음을 감소시키고 상대적으로 양호한 파쇄입도를 얻고 상부의 대괴를 최소화하는데 목적이 있다. 따라서 발생하는 진동 및 발파폭음을 크게 감소시킬 수 있으므로 기존 노천발파 및 진동, 소음에 민감한 도심지 발파에서 그 이점을 활용하여 보다 안전적이고 경제적인 발파작업을 수행하는데 연구의 목적이 있다.